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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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Kaleidoscope
Firmware for Keyboardio keyboards and other keyboards with AVR or ARM MCUs. (by keyboardio)
I recommend looking at EasyAVR and its use with custom boards. This may be easier than working through the Arduino IDE once you get the initial legwork done. There are lots of alternatives too, such as:
TMK
Kaleidoscope
QMK
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.